/* =================================================================
// 1. GLOBAL VARIABLES & THEME SETUP
// ================================================================= */

:root {
    /* --- LIGHT MODE (Default) --- */
    --color-primary: #0077b6;      /* A slightly darker blue for better visibility on white */
    --color-bg-body: #f8f9fa;      /* Light Grey Background */
    --color-bg-card: #ffffff;      /* White Cards */
    --color-bg-nav:  #ffffff;      /* White Nav */
    
    --color-text-main: #2d3436;    /* Dark Grey Text */
    --color-text-muted: #636e72;   /* Medium Grey Text */
    
    --shadow-card: 0 4px 6px rgba(0, 0, 0, 0.05);
    --border-color: #e0e0e0;
    
    /* Typography */
    --font-heading: 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-code: 'Fira Code', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-s: 1rem;
    --spacing-m: 2rem;
    --spacing-l: 3rem;
    --border-radius-m: 6px;
}

/* --- DARK MODE OVERRIDES --- */
/* This activates when the JS adds the 'dark-mode' class */
body.dark-mode {
    --color-primary: #61dafb;      /* Bright Cyan (pops on dark) */
    --color-bg-body: #121212;      /* Deep Dark Background */
    --color-bg-card: #1e1e1e;      /* Dark Grey Cards */
    --color-bg-nav:  #1e1e1e;      /* Dark Nav */
    
    --color-text-main: #e0e0e0;    /* Light Text */
    --color-text-muted: #a0a0a0;   /* Muted Light Text */
    
    --shadow-card: 0 4px 6px rgba(0, 0, 0, 0.3);
    --border-color: #333333;
}

/* =================================================================
// 2. BASE RESETS
// ================================================================= */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    /* HERE WE USE THE VARIABLES, NOT HARDCODED COLORS */
    color: var(--color-text-main);
    background-color: var(--color-bg-body);
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s;
    font-weight: 600;
}

a:hover {
    text-decoration: underline;
    opacity: 0.8;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-l) var(--spacing-s);
}

.section-title {
    font-family: var(--font-code);
    font-size: 1.8rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-l);
    padding-bottom: var(--spacing-s);
    border-bottom: 2px solid var(--border-color);
}

.section-lead {
    font-size: 1rem;
    font-family: var(--font-code);
    color: var(--color-text-muted);
    margin-top: -1.5rem;
    margin-bottom: var(--spacing-l);
}

/* =================================================================
// 3. HEADER & NAVIGATION
// ================================================================= */

.site-header {
    background-color: var(--color-bg-nav);
    box-shadow: var(--shadow-card);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s;
}

.nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-s);
    padding-bottom: var(--spacing-s);
}

.logo {
    font-family: var(--font-code);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--color-text-main);
}

.logo .cursor {
    color: var(--color-primary);
    animation: blink-cursor 1s infinite;
}

@keyframes blink-cursor {
    50% { opacity: 0; }
}

.nav-links {
    list-style: none;
    display: none; 
    flex-grow: 1;
    justify-content: center;
}

.nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-bg-nav);
    padding: var(--spacing-s) 0;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    z-index: 999;
}

.nav-links li {
    margin: 0 var(--spacing-s);
}

.nav-link {
    display: block;
    padding: var(--spacing-xs) 0;
    font-family: var(--font-code);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text-main);
    border-bottom: 2px solid transparent;
}

.nav-link:hover {
    color: var(--color-primary);
    text-decoration: none;
    border-bottom-color: var(--color-primary);
}

.right-buttons {
    display: flex;
    align-items: center;
    gap: var(--spacing-s);
}

/* Theme Toggle Button */
.theme-toggle, .menu-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--color-text-main);
    cursor: pointer;
    padding: 0.5rem;
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius-m);
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.menu-toggle {
    display: flex; 
}

.theme-toggle:hover, .menu-toggle:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background-color: rgba(0,0,0,0.05);
}

/* Desktop Navigation */
@media (min-width: 768px) {
    .nav-links {
        display: flex;
        flex-direction: row;
        position: static;
        width: auto;
        box-shadow: none;
        padding: 0;
        background-color: transparent;
    }
    .menu-toggle {
        display: none;
    }
}

/* =================================================================
// 4. HERO SECTION
// ================================================================= */

.hero-section {
    padding-top: 4rem;
    padding-bottom: 4rem;
}

.greeting {
    font-family: var(--font-code);
    color: var(--color-primary);
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.name-heading {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, 4rem);
    color: var(--color-text-main);
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.title-heading {
    font-family: var(--font-code);
    font-size: clamp(1.2rem, 5vw, 2rem);
    color: var(--color-text-muted);
    font-weight: 600;
    margin-bottom: var(--spacing-m);
}

.profile-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-s);
    margin-bottom: var(--spacing-m);
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.profile-meta .meta-item {
    background-color: var(--color-bg-card);
    border: 1px solid var(--border-color);
    padding: 0.2rem 0.8rem;
    border-radius: 20px;
    font-style: italic;
}

.tagline {
    font-family: var(--font-code);
    color: var(--color-text-main);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-l);
    border-left: 3px solid var(--color-primary);
    padding-left: var(--spacing-s);
}

.social-links {
    display: flex;
    gap: var(--spacing-s);
    margin-bottom: var(--spacing-l);
}

.social-links a {
    font-size: 1.8rem;
    color: var(--color-text-main);
    transition: transform 0.2s;
}

.social-links a:hover {
    color: var(--color-primary);
    transform: translateY(-3px);
}

.cta-button {
    display: inline-block;
    padding: var(--spacing-s) var(--spacing-m);
    background-color: var(--color-primary);
    color: #ffffff; /* Always white text on button */
    font-family: var(--font-code);
    font-weight: 700;
    border-radius: var(--border-radius-m);
    transition: opacity 0.2s, transform 0.2s;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: none;
    cursor: pointer;
}

/* Specific text color override for dark mode button if needed */
body.dark-mode .cta-button {
    color: #121212; /* Dark text on bright cyan button */
}

.cta-button:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    text-decoration: none;
}

/* =================================================================
// 5. SKILLS SECTION
// ================================================================= */

.skills-group-card {
    background-color: var(--color-bg-card);
    padding: var(--spacing-m);
    border-radius: var(--border-radius-m);
    box-shadow: var(--shadow-card);
    flex: 1;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s;
}

.skills-grid-split {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-l);
}

.skills-group-title {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-m);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: var(--spacing-s);
}

.skills-icon-grid-split {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: var(--spacing-m) var(--spacing-s);
    text-align: center;
}

.skill-item-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-s) 0;
    border-radius: var(--border-radius-m);
    transition: transform 0.2s;
}

.skill-item-card:hover {
    transform: translateY(-3px);
    background-color: rgba(0,0,0,0.03); /* Subtle hover */
}

body.dark-mode .skill-item-card:hover {
    background-color: rgba(255,255,255,0.05);
}

.skill-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
}

.skill-name {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--color-text-main);
    font-weight: 600;
}

@media (min-width: 768px) {
    .skills-grid-split {
        flex-direction: row;
    }
    .skills-icon-grid-split {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* =================================================================
// 6. SOFT SKILLS
// ================================================================= */

.soft-skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-m);
}

.soft-skill-card {
    background-color: var(--color-bg-card);
    padding: var(--spacing-m);
    border-radius: var(--border-radius-m);
    border-left: 4px solid var(--color-primary);
    box-shadow: var(--shadow-card);
    border-top: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    transition: transform 0.2s, background-color 0.3s;
}

.soft-skill-card:hover {
    transform: translateY(-3px);
}

.soft-skill-icon {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.soft-skill-card h3 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-main);
}

.soft-skill-card p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* =================================================================
// 7. EXPERIENCE
// ================================================================= */

.experience-timeline {
    position: relative;
    padding-left: 20px;
}

.experience-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    background-color: var(--border-color);
}

.experience-card {
    background-color: var(--color-bg-card);
    padding: var(--spacing-m);
    border-radius: var(--border-radius-m);
    margin-bottom: var(--spacing-l);
    position: relative;
    border-left: 5px solid var(--color-primary);
    box-shadow: var(--shadow-card);
    border-top: 1px solid var(--border-color);
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.3s;
}

.experience-card::after {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--color-primary);
    border: 3px solid var(--color-bg-body); /* Match body bg to create 'cutout' effect */
    left: -27px; 
    top: 25px;
}

.header-line {
    display: flex;
    flex-direction: column;
    margin-bottom: var(--spacing-xs);
}

.experience-card h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    color: var(--color-text-main);
    font-weight: 700;
}

.duration {
    font-family: var(--font-code);
    font-size: 0.85rem;
    color: var(--color-primary);
    margin-top: 5px;
}

.institution {
    font-style: italic;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
}

.details, .bullet-list {
    font-size: 0.95rem;
    color: var(--color-text-main);
}

.bullet-list {
    margin-top: var(--spacing-xs);
    margin-left: var(--spacing-m);
    color: var(--color-text-muted);
}

.bullet-list li {
    margin-bottom: 5px;
}

@media (min-width: 600px) {
    .header-line {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }
}

/* =================================================================
// 8. PROJECTS
// ================================================================= */

.project-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-l);
}

@media (min-width: 768px) {
    .project-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
}

.project-card {
    background-color: var(--color-bg-card);
    border-radius: var(--border-radius-m);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: transform 0.3s, background-color 0.3s;
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-5px);
}

.project-image-wrapper {
    width: 100%;
    height: 200px;
    overflow: hidden;
    border-bottom: 3px solid var(--color-primary);
    background-color: #ddd; /* Placeholder color */
}

.project-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s;
}

.project-card:hover .project-image-wrapper img {
    transform: scale(1.05);
}

.project-content {
    padding: var(--spacing-m);
}

.project-content h3 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-main);
}

.project-desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-s);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-m);
}

.tech-tag {
    font-family: var(--font-code);
    font-size: 0.75rem;
    background-color: rgba(0,0,0,0.05); /* Light grey in light mode */
    color: var(--color-primary);
    padding: 0.3rem 0.6rem;
    border-radius: var(--border-radius-m);
}

body.dark-mode .tech-tag {
    background-color: rgba(255,255,255,0.1); /* Translucent in dark mode */
}

.project-link {
    display: inline-block;
    color: var(--color-primary);
    font-family: var(--font-code);
    font-weight: 600;
}

/* =================================================================
// 9. FOOTER
// ================================================================= */

footer {
    background-color: var(--color-bg-nav);
    padding: var(--spacing-l) 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    transition: background-color 0.3s;
}

.footer-content h3 {
    font-family: var(--font-code);
    font-size: 1.8rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-s);
}

.contact-message {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-m);
}

.footer-socials {
    justify-content: center;
    margin-top: var(--spacing-l);
    margin-bottom: var(--spacing-l);
}

.copyright {
    font-family: var(--font-code);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: var(--spacing-s);
}